-3n+21=-3(n-8)-n

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Solution for -3n+21=-3(n-8)-n equation: 



-3n+21=-3(n-8)-n

We move all terms to the left:

-3n+21-(-3(n-8)-n)=0



We calculate terms in parentheses: -(-3(n-8)-n), so:

-3(n-8)-n

We add all the numbers together, and all the variables

-1n-3(n-8)

We multiply parentheses

-1n-3n+24

We add all the numbers together, and all the variables

-4n+24

Back to the equation:

-(-4n+24)



We get rid of parentheses

-3n+4n-24+21=0

We add all the numbers together, and all the variables

n-3=0

We move all terms containing n to the left, all other terms to the right

n=3

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